David Tennant
If you mean Barty Crouch Junior, it was played by David Tennant
Barty Crouch Junior is a Death Eater and is bad but his father Barty Crouch Senior is very good; he loaths Dark Wizards.
David Tennant does appear in Harry Potter and the Goblet of Fire as Barty Crouch Jr.
Barty Crouch Jr was born around 1962, although his exact year of birth was unknown. This puts him at 33 or 34 at the end of Harry Potter and the Goblet of Fire, which was set between 1994 and 1995.
Barty Crouch Jr is played by David Tennant.
The following characters died in Harry Potter and the Goblet of FireBertha Jonkins (mentioned only)Franky Bryce - a muggle murdered by Lord VoldemortBarty Crouch Sr - murdered by Barty Crouch JrCedric Diggory - murdered by Peter Pettigrew on Lord Voldemort's ordersBarty Crouch Jr was kissed by a dementor, rendering him as good as dead.
Yes, both characters are played by David Tennant.
He is the Head of the Department of Magical Law Enforcement's son Bartemius "Barty" Crouch Junior (played by David Tennant).
The Death Eater posing as Professor Moody, Barty Crouch Junior.
Barty Crouch Jr costs 900,000 studs on Lego Harry Potter.
In the Goblet of Fire, the fake mad eye moody is Barty Crouch junior who is a Death eater trying to kill Harry. He is actually the son of Barty Crouch, the leader of the ministry of magic
Alastor 'Mad-Eye' Moody. Unfortunately, Barty Crouch Jr spent the year impersonating him.